/Engine/Source/Runtime/GeometryCore/Public/VectorUtil.h
Snap Value to steps of Increment (centered at 0, ie steps are -Increment, 0, Increment, 2*Increment, ...). Optional Offset can be used to snap relative value.
namespace UE { namespace Geometry { template<typename RealType> RealType UE::Geometry::SnapToIncrement ( RealType Value, RealType Increment, RealType Offset ) } }